Bolt machine



Mar. 13, 1923.

BOLT MACHINE.

msn' Dic. s. 1920.

` 3 SHEETS-SHEET 2.

Wn, m. ,E a rdL cnu WWM J/ Mal". 13, 1923.

- 1,448,360. J. A. EDEN, 1R.

BOLT MACHINE.

FILED DEC. 6, 1920. 3 SHEETS-SHEET 3.

me: E Eden, Jr:

Patented Mar. 13, i923;

ra'isu'fr or iaiaate FICE AssIGNoE To WALTER H.l

som MACHINE.

Applicationfled December 6, 1920. Serial No. 428,456.

' To all whom t may concern.'

Be it known that lf, JAMES A. EDEN, J r., a citizen of the United States, and resident of Springfield, Massachusetts, have invented certain new' and useful Improvements in Bolt Machines, of which the following is a specification.

vMy invention aims to provide certain improvements applicable generally tov machines used in the making of bolts or the turning of bolt blanks and particularly useful in the manufacture of stay bolts' for boilers.`

The accompanying drawings villustrate an embodiment of the invention. l'

Fig. 1 is an elevation of oneend of a` stay bolt making machine,showing the particu-L lar unit thereof which is used for turning down bolt blanks, with'my improvements applied thereto;

' Fig. 2 is a sidev elevation of broken away; y. l

Fig. 3 is adetail in elevation. of the driving mechanism in Fig. I2;

the same partly F ig. 4 ris an ele-vation of a blank produced )mediate portion of its 'length a worm .'21

in the machine illustrated;-

Fig. 5 is ay rear elevation, on an enlarged scale, of the mechanism shown inthe upper part of Figs. 1 and 2; y

Fig. 6 is a vertical` sectionshowing the feeding and neckingniechanism on the plane indicated by the line'6-j6 of Fig. 5.

l The bolt blank produced by the machine has a shank 1 (Fig. 4) with enlargements2 and 3- at the upper ends which are to be threaded in other units of the-machine, and has a button head 4 with a square-d projection 5 on its end to be used invscrewing the bolt into the plates of the` boiler. It is desirable to form 'also a'neck 6 between the enlarged portion 3 of the blank and the face of the head 4, so that when the part 3 is threaded, the cutters will finish the thread sharply at the lower `end `"without ldigging into the face of the head. y-The' part '3 is sometimes fnishedwithatapered thread, of larger diameter uat' the lower end, and the bolts are varied in other ways from the particular design shown; my invention being applicable also to bolts ofvarious designs. f

' The parts 2 and 3 ofthe blank are turned down accurately to diameter bymeans of turningheads 7 and 8, which are set at fixed vertical distances. on slides 9 traveling' inl vertical guideways on the inner faces :of

the uprights 10 of the machine, which are mounted on a base 11. their upper ends reduced to form rods' 12 which pass up` throughfthe cross-head 13 and are pressedupwardly lby means *of springs l14 bearing on the cross-head and The slides 9 have engaging washers 15 fastened on the upper ends 'ofthe rods. These springs effect the retraction of the turning heads. aty the end l of an operation. The parts are shown in retracted position lin Figs.v 1 and 2,` `andin their advanced position in lFig. 6. rlfhe turning heads 7l and 8 arel of any ,usual y or suitable construction, andthe head 8 is split and its forward half hinged at 16iso` that this half may b e swung outward to'.

permit removal of the blank.V

The blank is rotated, the projection 5 on i I the lower end thereof fitting in a` lsocket. 17 which is rotated through suitablegearing from a horizontal shaft 18 extending below the base 11. `The shaft 18 through suitable intermediate gearingindicated at 19 drives a vertical shaft 20 which carries atan inter- (Fig. 3)y which actuates a worm gear 22..V

'ed` a sleeve having at oneend a clutch member 24 (Fig. 5) adapted to be shifted tothe right` into engagement with a correspondingly toothediclutch member 25"onthe shaft 23 and carrying a cam 26 which at'the end of each` revolutionstrikes a pin 27 and causes the sleeve to shift to the left, disconnecting the clutch and stopping the revolution of the sleeve. The opposite endv of the sleeve isengaged by a spring 28 surrounding the shaft 23 .and reacting against the bearing 29 thereof to Apush the sleeve into clutched position. The stop pin 27 is Apressed upward by a spring y30` and is* pulled downward by hand or pedal through a link 31. This is an ordinary' type'of one-revolution clutch, and various other known types may be susbstituted therefor. `When the'operator' pullsf down the .stop pin 27 the sleeveis clutchedin and the sleeve makes one complete revolution with the shaft and is then rautomatically unllO 'with the work.

.the roller 33.`

controls the feeeding and retraction of the turning heads.

Un the central. part of the sleeve there is vmounted cam 32, Fig. 6,r which bears against a roller 33 mounted between a pair of arms 34 fixed on a hub 35 which turns on a short shaft 36 carried in brackets 37 on the backs of the side frames l0 of the machine. Mounted on the same hub 35 and in the planes of the arms 34 are arms 38 which entend to points just inside of the slides 9 and are connected tothe latter through links 39to allow'for lateral play.

At the beginning of the stroke the roller 33 rests onv the smallest part 40 of the face of the cam. The rotation. of the cam in the direction of the arrow operates tl'irough the yroller y33 and arms 36 to feed the turning` heads d wn quickly to engagement The continued rotation of the cani feeds vtheheads downward continuously at a regular rate untilthepoint 41 of the cam'arrives at the point of Contact with it `this point the turning operation iscompleted and the movement from here to the end 42 of the cam is a Adwell during which the turning` heads are held stationary, the rotation of the blank continuing. As the cam advances further, thesprings retract thefcutter heads and the roller-33 is forced down to the starting point 40o-f the cam,-.at which point-.the

clutch is' automatically opened, the machine stops andthe operator withdraws the blank and inserts anew one and presses the treadle to repeat the operation.

In order to form the neck on theV blank, there is provided a necking tool or cutter 43 y(Fig. 6) adapted to reciprocate in a tubular guide 44 fastened in thesolid back of the turning head 7 and having a stem 45 pressed outward by means ofa spring 46 bearing on the end of the tube 44 and against a head on the stem. @n a bracket 47 mount- `ed on the rear of the turning head is a transverse shaft 48 carrying` a lever with a forked arm 49 embracing the outer end of the stom and held between shoulders 50 The opposite arm 52 oi' the lever is forked at its outer end and carries a pin extending through a slot 54 in a link 55 of adjustable length connected at its upper end to one arm 56 of a lever whose yother arm-57 is pressed downward to pull up the link and push in lthe necking tool at the proper time. The' levers 56, 57 are mounted on a Vshort sha-ft 5S carried in a bracketv 59 mounted on one of the side frames 10 of the machine 1 as shown in Fig. 5.l From this bracket 59 an arm 60 extends to a. point under the varm 59 and carries an adjustable stop 6l (Fig-6) which limits the downwardfmove'- ment 0f the arm 56 and the withdrawal of the necking tool. i

For actuating` the arm 57 the same sleeve 24 which carries the cam 32 has a cylindrical hub on which is mounted a pin 63 adapted to engage a projection 64 on the arm, pressing the latter downward and the turning tool inward, holding it there fora determined short interval, say during six revolntions of the blank, and then riding over the cam shaped projection 64 and releasing the necking tool to permit its withdrawal by the spring 45. rllhe shape of the projection 64 is such that -the necking tool will be pressed gradually inward to its full depth, held there for a moment and then finished its work on the part 3 of the bl'ankl and the facing of the part 4. During the downward feed of the head the pin 53 will move down in the slot 54, the link 55 being held up to the position shownbymeans of the stop 6l. Excessive downward movement 0f the pin 53 while it is' in the upper part of the slot is prevented by means of a plate 69 on which the lower `edge of the arm 52 rests. At the end of the downward feed the pin 53 will lie at the lower end` of the slot 54. Therefore, as the pin 63 strikes the oblique faceof the projection 64 the necking tool will be gradually advanced and held until the necking operation is completed and then withdrawn just before the end 42 or' the camv passes its operative position, and the retraction of the turning head commences.

lWith the use of myimproved machine it is possible in a` single operation' to turn` the yblank ofthe cylindrical or tapered form desired and to neck the end of this portion, thus turning out` the finished blanks more expeditiously and cheaply than hasr heretofore been possible. v v H There are various other bolts provided with necks and which can be economically manufactured with the aid of this machine with such modifications asa-re necessaryto adapt it to the particular style of bolt in question. In referring to stayboltsand the made by those skilled in the art without departing from the invention as defined in the following claims.

What I claim is:

l. A machine for turning headed staybolt blanks and the like including in combination means for rotating the blank, a turning head engaging a portion of the blank near the head thereof and movable lengthwise of the work, a necking tool carried by the turning head and means for feeding said turning head and advancing the necking tool.

2. A machine for turning headed staybolt blanks and the like including in combination means for rotating the blank, a turning head engaging a portion of the blank near the head thereof and movable lengthwise of the work, a necking tool carried by the turning head and means for feeding said turning head and advancing the necking tool, and maintaining it advanced for a determined interval after the advance of the turning head.

3. A machine for turning headed staybolt blanks and the like including in combination means for rotating the blank, a turning head engaging a. portion of the blank near the head thereof and movable lengthwise of the work, a necking tool carried by the turning head and means for feeding said turning head and advancing the necking tool, and means for withdrawing the necking tool on the retraction of the turning head.

4:. A machine for turning headed staybolt blanks and the like including in combination means for turningv down a portion of the blank near the head, feeding mechanism for said turning means adapted to cause a dwell in `the feeding movement, the necking tool and means for advancing said necking tool and holding it advanced y during a dwell in the feeding'movement.`

5. A machine for turning headed staybolt blanks (and the like including in combinationmeans for turning down a portion of the blank near the head, feeding anderetracting mechanismfor said turnin'gm'eans ladapted to cause a dwell at the end of a feeding movement, a necking tool. andv JAMES A. EDEN; JR. 

